No, really, Deadly Chickens. Sumom Games' kickstarted shoot 'em up Humans Must Answer casts players as a vengeful clucker who's out to destroy humanity in a state of the art battleship, and is out today on GOG.com. To celebrate, here's an appropriately action-packed launch trailer.
Considering that it hails from two ex-S.T.A.L.K.E.R. developers, Humans Must Answer is probably worth well a look.